Manual:Infantry Manual:MOS:Infantry

3100 Light Weapons Infantryman
A marine who is charged with locating, closing with, and destroying threat forces by fire and maneuver. Every marine is considered this MOS outside of their chosen specialty. Requirements: IN100, IN101, IN102, IN104, IN106, IN113, IN122, IN151

3110 Machine Gunner
A marine who has been trained in the tactics, techniques, methodology of utilizing heavy rapid-fire weaponry in the support of infantry forces. Requirements: IN100, IN101, IN102, IN104, IN106, IN108, IN110, IN113, IN122, IN151

3120 Missile Infantryman
A marine who has been trained in the tactics, techniques, methodology of utilizing missile ordnance in the support of infantry forces. Requirements: IN100, IN101, IN102, IN104, IN106, IN108, IN110, IN112IN113, IN122, IN151

3130 Assault Pioneer
A light infantryman who has been given limited advanced training in certain combat engineering tasks such as mine warfare, mobility warfare, fortification construction, and demolitions. Requirements: CE100, CE152, CE220, IN100, IN101, IN102, IN104, IN106, IN113, IN114, IN122, IN151